Inner tube



R. B. DISBROW.

INNER TUBE. APPLICATION FILED JUNE 16, 1919.

Patented Jul 12, 1921.

UNITED STATES PATENT OFFICE.

REUBEN BQDISBROW, OF ST. PAUL, MINNESOTA.

INNER TUBE.

Application filed June 16,

and has for its object to provide an improved inner tube therefor,

The invention consists 1n prov1d1ng the inner tube, at its outer portion, that 1s, m

that portion that engages the tread of the casings, with increased thickness and in providing thislincreased thickness w1th a' multiplicity of projecting bearing bosses or, lugs spaced from each other so that they increase the elasticity of the tire and at the same time prevent the innertube from be1 ng punctured by plugs and other sharp articles, such as small nails that may pass through the casing into the inner tube.

The invention is illustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views.

Referring to. the drawmgs:

Figure 1 is a viewshowing a portion of the tread of the inner tube,

Fig. 2 is a side elevatlon of the lnner tube section shown in Fig. 1; and

Fig. 3 is a transverse section taken through the inner tube and through a casing and rim to which it is applied.

()f the parts shown in Fig. 3, the numeral 4 indicates the wheel felly, the numeral 5 the wheel rim, the numeral 6 the tire casing and the numeral 7 the inner tube, which latter is also shown in Figs, 1 and 2. The said )arts 4, 5 and 6 are of the usual or any suita 1e construction but the inner tube, in accordance with my invention, isat its outer portion 7 made relatively very thick, pref- Specification of Letters Patent.

Patented July 12, 192-1.

1919. Serial No. 304,574.

erably being about 4.- or '6 times as thick as the body or main portion of said inner tube.

The thick outer portion of the inner tube on its outer face is formed with longitudinal grooves or channels 8 and transverse grooves or channels 9 that form lugs 10 and 11.-

Preferably the said grooves and channels are so run that the bearing lugs will be arranged in longitudinally alined rows but will be staggered transversely of the tire. These grooves and channels permit the bosses to move laterally thereby greatly increasing the elasticity of the inner tube.

Obviously, 'anysmall nail or tack that may work its way through the casing and into the thick portion, that is into'the lugs 10-11 or into the channels between the same will not puncture the inner tube and hence will not it will be as flexible as an ordinary inner tube and as easily applied in a casing or removed therefrom when deflated or partly deflated. The cost of this inner tube is not greatly in excess of that of an ordinary inner tube and the advantages derived from usage are very great. In fact, tire troubles will be greatly reduced.

WVhat I claim is:

An inner tube for pneumatic tires having its outer portion relatively thick and formed with circumferentialand transverse exterior channels forming rectangular bearin; lugs for engagement with the inner surface of the tire casing, the thickness of the tire beloxv the bottom of said lugs being greater than that at the inner portion of the tire. the bearing lugs being arranged in longitudinal rows but staggered transversely of the tire.

In testimony whereof I affix my signature in presence of two witnesses.

REUBEN B. DISBROW. \Vitnessesz' I CLARA DEMAREs'r, MARY GREENBERG. 

